Goodwill and Identifiable Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Identifiable Intangible Assets, Net
Gross Book Value	$ 73,504	$ 73,504
Accumulated Amortization	(36,121)	(28,989)
Amortization expense	7,132	8,837	7,462
Future amortization expense of identifiable intangible assets
2014	6,106
2015	4,873
2016	3,748
2017	2,997
2018	2,320
Thereafter	17,339
Total	37,383
Customer relationships
Identifiable Intangible Assets, Net
Gross Book Value	40,404	40,404
Accumulated Amortization	(20,978)	(15,579)
Customer relationships | Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Customer relationships | Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	15 years
Backlog
Identifiable Intangible Assets, Net
Gross Book Value	6,515	6,515
Accumulated Amortization	(6,515)	(6,375)
Backlog | Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	1 year
Backlog | Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Noncompete agreements
Identifiable Intangible Assets, Net
Gross Book Value	2,890	2,890
Accumulated Amortization	(2,649)	(2,380)
Noncompete agreements | Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Noncompete agreements | Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	7 years
Tradenames
Identifiable Intangible Assets, Net
Gross Book Value	23,695	23,695
Accumulated Amortization	$ (5,979)	$ (4,655)
Tradenames | Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Tradenames | Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	25 years